Non-destructive testing of interfacial stiffness based on spring model for diffusion bonding interface of titanium...

Area of Science:

• Materials Science
• Non-Destructive Testing
• Mechanical Engineering

Background:

• Ultrasonic testing is crucial for detecting defects in diffusion bonding interfaces.
• Complex component geometries and weak defect signals pose challenges for current ultrasonic methods.
• Titanium alloys are widely used in aerospace and other demanding applications.

Purpose of the Study:

• To develop an interfacial stiffness characterization method for ultrasonic testing of diffusion bonding in complex-surface titanium alloy components.
• To analyze the influence of complex geometry and bonding interface variations on ultrasonic testing results.
• To enhance the detection of diffusion bonding defects.

Main Methods:

• Development of an interfacial stiffness characterization method based on a spring model.
• Establishment of finite element models to simulate ultrasonic fields and defect responses.
• Conducting ultrasonic C-scan experiments on specimens with artificial defects and a complex-surface titanium alloy component.
• Recommendation of 15 MHz as the optimal testing frequency.

Main Results:

• Finite element models effectively analyzed defect response, complex surface effects, and interface depth inconsistencies.
• The proposed interfacial stiffness characterization method demonstrated applicability to complex-surface components with inclination angles up to 14°.
• Experimental validation confirmed the method's effectiveness in improving defect detection at diffusion bonding interfaces.

Conclusions:

• The novel interfacial stiffness characterization method enhances ultrasonic testing of diffusion bonding interfaces in complex-surface titanium alloy components.
• The method offers improved defect detection capabilities, addressing limitations of traditional ultrasonic testing.
• A testing frequency of 15 MHz is recommended for optimal results.